OK, made it through this update. I'm kind of torn on the "MC's an idiot" part. Yes, both he and Laura have made some less-than-great (and in some cases, downright bad) decisions (Kallie and Shelley really are just along for the ride in this regard). But in the circumstances they're in, who would do consistently better? OK, if you've made it through military SERE training (the real kind, not the online version), you probably would. The rest of us?
But it's a similar tension that was there with N&T's MC--he beat himself up over everything that didn't go their way. Sometimes, it was something he legitimately should have done better; sometimes it wasn't (no, replacing the timing chain (no available engine in a '69 Charger had multiple timing chains) isn't something he should have routinely had done at the shop). It's unreasonable for him to expect perfection of himself, and even then things might go (further) to shit. But he doesn't give a damn about being reasonable, he cares about keeping Carol and Naomi alive (and himself insofar as it helps them). And it's kind of the same thing here--you don't get a trophy for being reasonable, your prize is that you stay alive.
I'm willing to go with "this is a stupid plan for all of them"--it doesn't seem to be getting them very far, after all. OTOH, they're still alive, and they are moving in what they reasonably believe to be a good direction (I don't think we have any way of knowing at this point whether the hospital will be the salvation they hope for--and I kind of doubt it--but it seems a pretty fair target). And "stupid plan" is always by comparison, and I don't know what better alternative there is. We know the fog trashes vehicles, so there aren't any of those available. Find a tall building, get to the top (above the fog), and... what? Wait it out? For how long, and with what provisions?
And since we're told that we meet the next LI in this chapter, and shotgun lady is the only human we meet, I guess it's her. Looks thicker than I'd prefer, but she was wearing a heavy coat (and possibly more under it). Didn't otherwise get any idea of what she looks like, who she might be, or how she's going to make nice with the others. But I think I'm leaning away from "she's MC's ex" because of what that'd do to the relationships.
Other stuff? I think we're starting to see that FWB isn't going to work any better here than it did in N&T or TID. Kallie already had some feelings for MC, and we're starting to see them in both Laura and Shelley.